As it is not possible to show a quarter of a day in the calendar, a normal year is taken to be 365 days, and an extra day is added every four years as a Leap year. One complete revolution takes 365 days or a year. When the earth revolves round the sun, it spins on an elliptical orbit at a speed of 18.5 miles per second or 66,600 m.p.h. Earth, by analogy, cannot be the only exception. (vi) Planetary Bodies are Spherical:Īll observations from telescopes reveal that the planetary bodies, the Sun, Moon, satellites and stars have circular outlines from whichever angle you see them. Only a sphere can cast such a circular shadow. It takes the outline of an arc of a circle. The shadow cast by the earth on the moon during the lunar eclipse is always circular. If the earth were flat, the whole world would have sunrise and sunset at the same time. As the earth rotates from west to east, places in the east see the sun earlier than those in the west. The sun rises and sets at different times in different places. If the earth were flat, the entire ship would be seen or obscured all at once. In the same way, when it leaves harbour, its disappearance over the curved surface is equally gradual. When a ship appears over the distant horizon, the top of the mast is seen first before the hull.
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